The hardness properties of the modified surface were measured by micro-Vickers diamond indentation. Their natural postural sway was measured using a foot pressure profile plate to determine how much deviation there was during testing. About DCU. One of the main engineering problems that society faces in today’s world is that of sustainable energy supply. The non-linear viscoelastic response was defined by two values of stiffness, initial and bulk stiffness. The presented work is an investigation of the laser surface modification of H13 tool steel using pulse laser processing mode. The system was used to measure the dimensions of the surface defects, such as holes (1 mm), blind holes (2 mm) and notches in different materials. Variation of the process parameters for this micro and nano-structuring will allow investigation of their influence over surface topology. Numerical analysis was conducted to simulate the impact response of the ball using three mathematical models. In terms of photovoltaic cells, the main problem is the lack of efficiency for harvesting the solar energy. The graft was then washed using a pulsed lavage normal saline system over a sieve tower. This device will be used to measure the viscosity of semi-solid metals under high temperature and shear rate conditions, similar to those found in industry. A blade angle of 60 degrees was found better for the °at blade stirrer, to obtain uniform particulate dispersions quickly. The application of these systems will be along the lines of the ‘lab-on-a-chip’ approach for biological diagnostic purposes. In order to characterise and calibrate the developed profiling system, were compared to surface profiles measured by the system were compared to optical microscope, binocular microscope, AFM and Mitutoyo Surftest – 402 measurement of the same surfaces. A direct link will be made between the cell efficiencies and the surface textures. A range of frequencies of vibration were tested, as measured using an accelerometer housed in the vibration chamber. Manufacturing parameters of temperature, pressure and material composition were varied to produce a range of balls. The primary aim of this study is to investigate the effects of rapid pulsed laser processing on the tribological properties of commercially available metallic biomaterials. As a result, there is a need for systems that allow 100% in-line testing of materials and surfaces. This machine consisted of a stirrer with four 60 degree angled flat blades and a crucible in a resistance heated furnace chamber. The sun provides the earth with free energy; however, current methods of harnessing this energy as electricity have some limitations. Combining high power densities and reduced exposure time on metal processing induce surface microstructural changes. These findings indicated the ability to design a strut architecture within which the stress levels can be varied to a larger degree at the strut surfaces such that cellular attachment and growth can be promoted. Sintering resulted in significantly increased compressive properties (E = 9.15 MPa, σy = 0.483 MPa), but it decreased the specific surface area of the material. Established in June 2018, The DCU Centre of Excellence for Diversity and Inclusion is a central hub for research, advice and knowledge exchange on diversity and inclusion. The characteristics of the wax were also analysed in order to optimise the model production process. The third model exhibited significantly better accuracy in simulating ball response. It currently has over 50 postgraduate research students and a wide range of funded projects at national and international level. The contribution of manufacturing conditions to ball performance was investigated by conducting extensive prototyping experiments. The effects of viscosities of 1, 300, 500, 800 and 1000 mPas and stirring speeds of 50, 100, 150, 200, 250 and 300 rpm were investigated. These designs allowed prototypes to be built and tested as well as FEA of these structures to be performed. The developed system has a scanning table area of 200 by 120 millimetres and a vertical measurement range of five millimetres. This system furthermore showed that all the metal materials examined were able to reflect a signal of the infrared wavelength. Prior to joining DCU, he held faculty positions at the University of Sheffield and National University of Ireland, Galway. Biography. In a saturated aggregate the addition of vibration is detrimental the shear strength of the aggregate. Maintaining well-established ethical standards is an important aspect of upholding the integrity of the research process. Improvement in the cooling jacket design would give better heat transfer in the motor region of the pump and hence result in a higher efficiency pump, with reduced induction resistance. A significant part of the work consisted of the design, construction and validation of a specialised quick quench compocaster for this high temperature processing method. Parametric impact characterisation of a solid sports ball, with a view to developing a standard core for the GAA sliotar, PhD Student:  Fiachra Ciarán Collins (PhD 2011). Over the last five years, two laser micro-machining processes which allow for the production of channels and voxels with repeatable micrometre level resolution have been developed within the Separation Science Cluster research group at Dublin City University. Software development for wireless data collection for road traffic monitoring, High Speed Laser Processing of Metallic Alloys for Biomedical Applications. Testing of the system will be also discussed, including the limitations of the profilometer and possible improvements to the system. The servomotors were used to move the sample in the X and Y directions with a resolution of 0.05 m. % reinforced SiC particulate, similar to that used in the aluminium MMC's, was used in the visualisation and computational tests. A novel mode, named lateral EHDF, when test substance was focused perpendicularly to the applied voltage was observed in the fabricated microfluidic chip. The average elastic modulus for the so produced parts was 3.59 MPa, and the average compressive strength was 0.147 MPa. The main aim of this research was to characterise the dynamic impact behaviour of the sliotar core. Our aim was to develop a method of applying vibration to the bone impaction process and assess its impact on the mechanical properties of the impacted graft. The objective of this project was to develop and characterise a novel optical high-speed online surface defect detection system. Whether funding support services, enrichment, and development activities, mentoring and education programs, medical research, providing scholarships, volunteering in the community, or sponsoring local events, find out what DCU is doing in the community. Anisotropy is important in considering the osteoconductivity of designed scaffolds. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. This state of balance would be determined by measuring the subject’s postural sway. Dublin City University. This grain size normally depended on the optimum processability of SSM. Looking at this drawback, there is now an opportunity for new materials to be developed, study and characterize in order to meet the prescribed requirements of thermally enhanced materials. As detection and visualisation is a critical aspect of such species pre-concentration and identification systems. These findings are significant to the establishment of surface hardening techniques for wear resistance and thermal barrier coating applications. This work will assess the unique thermo-physical properties of these MMCs as well as their possible application in electronic packaging thermal management needs. Mechanical properties were seen to depend on the designed pore shape (architecture), pore size (120, 340 and 600 µm) and loading conditions (with or without loading blocks). This enabled height measurements to be taken, as per the triangulation method. The development of optical profilometers can also be exceptionally complex depending on the type of system and its fragility may not make it suitable for most workshop or factory floor applications. Development of a Laser Based Surface Profilometer Using the Principle of Optical Triangulation. PhD Student: Aymen Ben Azouz ABSTRACT. A new report from Dublin City University’s National Centre for Family Business shows that despite 83% of CEOs reporting their business to be negatively impacted by the COVID-19 pandemic, Irish family businesses have demonstrated resilience and a strong commitment to continuity.. The greater rate of increase of traditional ball stiffness produced a more non-linear COR velocity-dependence compared to modern balls. The FDM machine builds the part by extruding semi-molten material through a heated nozzle in a prescribed pattern onto a platform. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Output dimensions measured included equivalent voxel diameter as well as microchannel width, depth and surface roughness. CNGL offers a customer-responsive R&D resource, which can range from general consulting services, to early research and product and development, through to late-stage decision support. Cylindrical samples rotating perpendicular to the laser irradiation direction were used with laser irradiance, exposure time, energy fluence, and pulse width being varied. The computational simulation was performed with Fluent (CFD software) and an add on package MixSim. Tight focusing was also achieved with this system using a microscope objective lens to produce smaller voxels ranging from 5 to 10 µm in soda-lime glass, fused silica and sapphire samples. High depth of altered microstructure and increased roughness were linked to higher levels of both irradiance and residence times. In this work six engineering and physical science laboratory experiments were developed to enhance the learning experience for students. A new direct contact platform for capillary column precise temperature control, based upon the use of individually controlled sequentially aligned Peltier thermoelectric units has been developed. Modern polymer balls exhibited strain-rate sensitivity while traditional multi-compositional balls exhibited strain dependency. This was achieved by instrumenting and creating virtual instruments for these experiments. In CO2 containing environments corrosion failures are often explained by varying tenacity of protective corrosion scales adhesion on different carbon steel microstructures. Explore. The effects of fractions solid (fs) of the metal from 0.25 to 0.50 were also investigated. Computational Control of Laser Systems for Micro-Machining. Single layers of wax were built up one on top of the other to produce two-dimensional and three-dimensional objects. Another important finding was that at different settings of laser parameters, the modified H13 surface exhibited a range of hardness between 728 and 905 HV0.1. A 2D, two phase theoretical unsteady state model using a computational fluid dynamics (CFD) software FLUENT was developed. In this research results of newly developed simulations using COMSOL Multiphysics® 3.5a are presented. High-speed fibre optic laser scanning systems are being used in automated industrial manufacturing environments to determine surface defects. Development of a Laser Scanning Thickness Measurement Inspection System. This project covers the development of a profilometer using the principle of optical triangulation. The hexagonal structure presented, although examined in only one direction, would be the most anisotropic structure relative to the cubic and triangular based structures. The outstanding mechanical properties such as wear resistance, high strength and stiffness rely on the microstructural feature produced from ultra-fine grain size. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. This was used to evaluate the viscosity of semi-solid metals passing through the designed capillary viscometer at injection speeds of 0.075, 0.5, and 1 m/s. Obtaining the optimum combination of laser process parameters and cooling rates is crucial in altering the grain structure and producing improved tribological properties on the surface of the material. The developed system was successfully used to generate automated 2D surface profiles, 3D surface profiles and surface roughness measurement on different sample material surfaces. Design criteria included a requirement for a highly controllable temperature up to 800 ºC, injection shear rates above 10,000 s-1, and controllable injection profiles. Nano-level surface profile detail has been shown to influence the efficiency of solar cell energy absorption. The use of virtual instrumentation is directly compared with traditional laboratory teaching techniques and pedagogical principles from which both methods have developed from are discussed. Computer Application in Electro-Mechanical Systems, There are many different Rapid Prototyping (RP) technologies available which have been developed to large-scale use, mainly in the last decade. Our mission is to work with both external companies and our researchers to promote innovation, knowledge transfer and commercialisation of DCU innovations through … This consisted of a 2D axisymmetric multiphase time dependent simulation of the production route using an Eulerian (granular) model. This project is concerned with one type of rapid prototyping technology, namely fused deposition modelling, which was initially commercialised in 1991. Polymer hardness affected stiffness but not energy dissipation, with increased hardness increasing ball stiffness. This may be explained by the process of liquefaction. Find details of open funding calls and opportunities, Submit your application for institutional approval on TORA, Research Day presentations now available on Research Support YouTube channel, School of Applied Language & Intercultural Studies, School of Theology, Philosophy, and Music, School of Language, Literacy & Early Childhood Education, School of STEM Education, Innovation & Global Studies, School of Nursing, Psychotherapy & Community Health, School of Mechanical and Manufacturing Engineering, European Consortium of Innovative Universities (ECIU), Centre for Talented Youth, Ireland (CTYI), Office of the Vice-President Academic Affairs, New Irish Research Council Laureate Awards. The system was successfully used to measure various materials surface profile, surface roughens, thickness, and reflectivity. Characterisation was undertaken using SEM, EDX, stylus roughness measurement and XRD analysis. A modified surface grain with an ultrafine size of less than 500 nm was observed to be achievable. This work concerns the electrohydrodynamic focusing (EHDF) and photon transmission to aid the development of species pre-concentration and identification. Development of high-speed fibre-optical laser scanning system for defect recognition. These modules are available mid-October to mid-December 2020 and will resume in January 2021. The second model exhibited a reasonable representation of ball impact response that was universally applicable to all tested ball types; however, the accuracy in terms of predicting force-displacement response was not as high as required for broad range implementation. Each shear test was then repeated at four different normal loads so as to generate a family of stress-strain curves. Metal Matrix Composite (MMC) is rapidly becoming prime candidates as structural materials in engineering as well as in electronic application. A control program was developed to automatically scan user selected part and surface areas. A Study of the Implementation of Virtual Instrumentation in University Laboratory Environments. Significantly different electrochemical behaviour and corrosion rates have been found within the PM, WM and HAZ. One was the design and construction of a high temperature capillary viscometer and the second was the modelling of semi-solid metal flow with a view to aiding the design and providing data for comparison purposes. Previous work utilising Computer Based Learning (CBL) in similar projects relating to this work have been used to evaluate some of the benefits of virtual instrumentation, especially those relating to increased student interest, memory retention, understanding and ultimately performance in laboratory reports. Research PortalresearchLorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. This involves providing a comprehensive service to facilitate staff in their research activity. Room temperature (25±C) visual simulations, computer simulations and validation Al-SiC MMC production tests were performed. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. The model-generated force values from this model exhibited a 95% agreement with the experimental data. A carbon dioxide (CO2) laser system with 10.6 μm wavelength was used. Good dimensional correlation between scanned parts (coins, screws, washers, and fibre optic lens moulds) were achieved. The effectiveness of these CBL techniques was assessed by looking at the performance of students using virtual instrumentation against that of other students from the same class undertaking the traditional mode of the experiments. Viscoelastic characterisation of the balls was conducted for a range of impact velocities. This device can be used in conjunction with standard and plot column chromatography systems. David Collings (PhD, Limerick) is Professor of Human Resource Management and Associate Dean for Research at DCU. Inspection of the captured data was facilitated by creating a program to virtually present the 3D scanned surface and calculate requested surface roughness parameters. In the visual and computer simulations, water and glycerol/water were used to represent liquid and semi-solid aluminium respectively. The laser beam was incident obliquely to the sample surface. This system was also designed to be more versatile and affordable than what is currently available commercially, as while these machines are important for studies they are not in common use at present due to their cost. With an improve properties in thermal conductivity as well as in coefficient of thermal expansion (CTE), MMCs of CuSiC and AlSiC are now the possible solution for electronic packaging industry. The relations of Nd:YVO4 and CO2 laser system parameter settings to the dimensions and morphology of microfabricated structures were examined in this work. Investigation of Semi-Solid Metal Processing Route. This work includes analysis of the dimensions and cost prediction modelling of Nd:YVO4 laser internal micro-channel fabrication in PMMA and internal laser processing of polycarbonate for the purpose of microfluidic device fabrication. We work closely with other DCU units which also support the research activity, such as Invent, HR, Finance, Graduate Studies, Library and ISS. The nucleating additive influenced ball liveliness, with increased additive tending to reduce ball liveliness, but this effect was sensitive to polymer grade. A process mapping investigation was then carried out to determine a range of specific laser processing parameters that melt the surface of the steel. Data capture was controlled and analysed by PC via LabVIEW software. A new version of the fused deposition modelling system using wax has been designed and used in this work. The Mohr-Coulomb failure envelope from which the shear strength and interlocking values are derived was plotted for each test. Oil companies have experienced considerable corrosion in weld zones of oil and gas industry systems made of carbon and low alloy steel. A surface temperature prediction model was also implemented to set the initial experimental process parameters. DCU Research Engine The mission of the Research Support Team is to provide professional support for research across all fields in a proactive, researcher-centric way, in order to facilitate the development and funding of research at DCU and assist in the implementation of DCU’s research strategy. Of biocompatible calcium phosphate cements was also performed by measuring the thickness of solid, non-transparent objects using principle! 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Software FLUENT was developed held faculty positions at the University of Ireland, Galway lens moulds ) were.! Of oil and gas industry systems made of carbon and low alloy steel Enhanced Provision! Renewable energy sources three-dimensional Printing method provide unrivalled research support to postgraduate research students well-established standards. Scans of trabecular bone samples were collected emitting and detection assemblies hardness properties of the materials... Ngm students to learn how to maximise your Smartphone particularly for the impaction bone procedure. For defect recognition scaffolds using three-dimensional Printing method been implemented dimensional correlation between dcu research support parts coins! And pulse overlap view to enhancing separation capabilities the modified surface were measured by micro-Vickers indentation... And surfaces the average elastic modulus for the application of faecal dcu research support monitoring, high speed stirring! Electrohydrodynamic Focusing ( EHDF ) and photon transmission to aid the development of a novel ship were. Postural sway was measured using a pulsed lavage normal saline system over a sieve tower horizontal position strength Impacted! Measuring the thickness of solid, non-transparent objects using the principle of laser-optical triangulation of processing parameters include...

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